function __construct($http_method, $http_url, $parameters = null)
{
$parameters = $parameters ? $parameters : array();
$parameters = array_merge(OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
$this->parameters = $parameters;
$this->http_method = $http_method;
$this->http_url = $http_url;
}